/*
 *  Copyright 2008 Danny Lagrouw
 *  
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *  
 *      http://www.apache.org/licenses/LICENSE-2.0
 *  
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License. 
 */
package org.bastion.message;

import java.util.List;

import org.bastion.query.IDomainQuery;

/**
 * DomainMessage indicating that a domain object needs to query objects from a
 * persistence service. Results from the query can be passed back in the
 * message.
 * 
 * @param <T>
 *            type of the objects that are queried.
 */
public class QueryMessage<T extends Object> implements DomainMessage {

	private final IDomainQuery<T> query;

	private List<T> resultList;

	public QueryMessage(IDomainQuery<T> query) {
		super();
		this.query = query;
	}

	public List<T> getResultList() {
		return resultList;
	}

	public void setResultList(List<T> resultList) {
		this.resultList = resultList;
	}

	public IDomainQuery<T> getQuery() {
		return query;
	}

	public T getSingleResult() {
		return (resultList == null || resultList.isEmpty()) ? null : resultList
				.get(0);
	}

}
